CVE-2026-81387: Microsoft Excel Information Disclosure Vulnerability
Exposure of sensitive system information to an unauthorized control sphere in Microsoft Office Excel allows an unauthorized attacker to disclose information locally.
Other sources
Microsoft Excel Information Disclosure Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5569.1003Patch KB5002904 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5569.1003Patch KB5002914 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.20960 - Upgrade
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Fixed in 16.0.14334.20896 - Upgrade
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Fixed in 16.0.20326.20136 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20204Patch KB5002910
Event History
Frequently Asked Questions
What conditions does an attacker need to exploit this issue?
The CVSS vector indicates the attacker needs local access and user interaction. No privileges are required, but the attack is not described as remotely exploitable.
What is the expected security impact?
The reported impact is disclosure of sensitive system information, with high confidentiality impact. Integrity and availability impact are rated as none.
Which Microsoft Excel and Office deployments are listed as affected?
The affected software list includes Microsoft Excel 2016, Microsoft Office 2016, Microsoft 365 Apps for Enterprise, Microsoft Office 365 for Mac, Microsoft Office LTSC for Mac 2024, Microsoft Office LTSC 2024 for 32-bit and 64-bit editions, and Microsoft Office LTSC 2021 for 64-bit editions.